Inmates are throwing things from the third floor of St Louis city jail, after smashing the windows, according to reports.
The prisoners, at the City Justice Center, have broken the window panes and reportedly started a fire.
Crowds have gathered outside, believed to be made up of demonstrators and families and can be heard cheering.
At least a dozen prisoners can be seen standing by the broken windows.
KSK News reports that officers were told 30 to 40 inmates have armed themselves as part of the riots.
A spokesperson from the center has said: “We are aware of the disturbance on the third floor of the CJC and that authorities are responding accordingly.”
A cordon has been set up on the road to provide space between the jail grounds.
KMOX news states that people have crossed the cordon and are walking towards the jail.
The incident is believed to have begun around 9.30pm (3.30am GMT) and is ongoing.
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